Why Does My Oven Not Seem Clean After Using the Self-Clean Feature?

The self-clean cycle works by incinerating food particles. Normally, some ashes are left in the bottom of the oven after cleaning. If spills are too thick or heavy, normal self-clean temperatures will not penetrate and disintegrate them. Instead, they will turn into a hard carbon crust and adhere to the oven liner. To prevent this, wipe up any large spills before using the Self-clean cycle.